Periodic Table Crossword Puzzle

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Across
  1. 4. Father of the periodic table
  2. 7. Group 2, calcium, not as reactive as group 1
  3. 10. does not "fit" in the alkali metals because it is a gas. Makes up much of the Sun.
  4. 12. number of periods in the PT
  5. 13. makes up 78% of the air we breathe
  6. 16. the average mass of all the isotopes of that element
  7. 17. found in nature, soft shiny metal, used in hybrid car batteries and permenant magnets
Down
  1. 1. elements in groups 3-12
  2. 2. The periodic table is arranged by _____ ______ now.
  3. 3. most reactive nonmetals
  4. 5. in a regular, repeated pattern
  5. 6. Highly reactive, group 1 elements
  6. 8. Number of groups in the PT
  7. 9. All elements above Uranium, or number 92
  8. 11. The name of the inert gases, Group 18
  9. 14. essential element for a normal functioning thyroid
  10. 15. Mendeleev arranged the periodic table by atomic ________